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As far as I know, at the high level two types of charging mechanisms named as "offline" and "online" are supported in LTE technology. Rf and Ro interfaces are used for offline and online charging respectively. Charging Trigger Function (CTF) is integrated in NE (network elements like PGW, SGSN, SGW) and would be responsible to trigger "charging events" towards Rf and Ro interfaces.
In case of online charging system (OCS), charging events are received by OCF (online charging function) which takes decision on further usage of resource with the help of RF (Rating function) and ABMF (Account balance management function).

In case of offline charging system (OFCS), charging events are received by CDF (charging data function) which generates charging data records i.e. CDRs and send to charging gateway function (CGF). CGF acts as a gateway between 3GPP network and Billing domain. CGF sends this CDRs to billing domain (BD).

So basically the diffrerence between 2 is in case of online further usage of resource can be modified using RF (Rating function) and ABMF (Account balance management function) but in case of offline charging information does not affect, in real-time

At high level, there are two type of charging mechanism. One is known as online charging and the other one is offline charging. I want to dig more in the online charging mechanism. How many types of scenarios come out in online charging ?